In power transmission and distribution, voltage converters and current transformers are mainly used for protection and measurement functions. Our new Klippon® Connect instrument transformer terminal blocks in the TTB range were developed to meet all of the connection requirements of these two critical applications. The wiring of current transformers and voltage converters can be carried out particularly easily and safely with our new instrument transformer terminal block series – even in complex circuits. The prevention of operating errors during operation increases plant availability and extends the life cycle of the entire control cabinet. The requirements of the end user are therefore fulfilled to the highest degree.
In-application measurements and the protection of such measurements are among the main functions in the energy sector. Measuring devices require regular maintenance so that they remain informative and can continue to be used reliably in the industry. Above all, safety, reliability and simplicity are required here. Our instrument transformer terminal blocks ensure optimum, safe results by guaranteeing protection and enabling trouble-free measurements. For some technical connection conditions from the German-speaking countries we offer pre-assembled terminal strips according to the respective TAB. You can find an overview of these terminal strips here:
The planning phase is crucial for the success and cost-effectiveness of the entire panel building process. It requires intelligent interplay between digital article data and interconnected engineering tools. Efficient, easy wiring is key when it comes to the installation.
Our instrument transformer terminal blocks and our innovative products in general are impressively easy to use and boast a clear design. All functions of the instrument transformer terminal blocks can be distinguished from each other instantly.
Our Klippon® Connect products feature standardised test points which make automated testing and checking processes possible. This means that with our instrument transformer terminal blocks, your maintenance and testing tasks can be carried out much more safely and quickly.
The planning phase with our Klippon® Connect TTB range
The complete provision of data in the Weidmüller Configurator (WMC) enables the particularly simple selection of safety-critical accessories as well as the safe and rational configuration of your instrument transformer terminal blocks.
The terminal blocks in the TTB range and their accessories are highly standardised. Whether it's a PUSH-IN or a screw connection, all functions in relation to our instrument transformer terminal blocks can be used regardless of the selected connection solution.
The new instrument transformer terminal blocks in the TTB range are particularly compact and offer an outstanding function density in comparison with other solutions on the market.
The new TTB range includes a PE terminal block with the same contour. It can be connected to the instrument transformer terminal block via standard cross-connections. This simplifies and accelerates the earthing of star points in the control cabinet.
The installation phase with our Klippon® Connect TTB range
A cross-connection channel before and after the disconnect point of the instrument transformer terminal blocks ensures top flexibility for the installation. Neither the short-circuit function of the current transformers nor the testing possibilities are limited. In this way, even more complex circuit requirements can be realised with the same standardised accessories.
The integrated combi-foot enables the fast and flexible mounting of the instrument transformer terminal blocks on common G32 and TH35 mounting rail profiles. This means that retrofitting can take place without the cost-intensive replacement of the mounting rails.
The unique lever mechanism of the instrument transformer terminal blocks is particularly user-friendly, offering maximum safety for installation, maintenance and operation. The switching status is optimally visible in all lighting conditions. The disconnecting lever can be operated either manually or with a standard screwdriver. In addition, it is easy to implement multi-pole actuations. It also offers an easy way of realising multi-pole actuations with our instrument transformer terminal blocks.
The combination of disconnecting lever, short-circuit bridge and lever link in a single system guarantees that the secondary wiring of a current transformer is short-circuited before the longitudinal disconnection takes place. This "make before break" contact can be realised for up to four connections. This means that with our instrument transformer terminal blocks, you can easily and safely short-circuit current transformers in order to maintain measuring instruments.
The operation phase with our Klippon® Connect TTB range
All function-relevant and safety-relevant components are captively connected to the terminal block. This increases the reliability of the current transformer and voltage converter circuits during installation and maintenance work.
Angled test sockets enable the connection of 4.0 plugs in widths of up to 10 mm. Due to the alternating arrangement, all standard measurements can be performed with the instrument transformer terminal blocks without fanning-out, despite the small width of the terminal.
In order to guarantee maximum safety during installation and maintenance, an extensive colour range is available for the desired colour-coding of terminals, accessories, test sockets and lever links.
Klippon® Connect TTB range instrument transformer terminal blocks are certified by an independent body in accordance with the requirements of IEC 60947-7-1 (Annex D). This certification guarantees the safe use of TTB range instrument transformer terminal blocks over a long time period and is a recognised reference worldwide.
A patented CM (Comparative Measurement) lever link allows two instrument transformer terminal blocks to be selectively separated to connect a calibrated measuring device. After the measurement, the captive lever is returned to its original position, with the "make before break" contact remaining active. This is a unique feature of the TTB range which guarantees maximum safety for personnel and devices during current transformer short-circuiting.
The transparent safety cover system protects and seals the entire assembly including the instrument transformer terminal blocks. It is available either as a full-length profile or as an individual cover. It can only be fixed into place when all connection components are in their initial position. The assembly is optimally protected against unauthorised access without impairing visual inspection possibilities.
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In current transformer circuits, the ATTB 6 PG CT is equipped with a specially designed 2 and 3 pole self-shorting plug to guarantee a "make before break" (MBB) contact in all handling conditions.
For voltage circuits, a simple feed-through plug offered with the ATTB 6 PG VT guarantees the same ease of handling and safety, which is also required for voltage circuits.
Uniform accessories from the PUSH IN A-Series reduce inventory costs and increase productivity in production.
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For some technical connection conditions from the German-speaking countries, we offer prefabricated strips according to the respective TAB. You can find an overview of these terminal strips here:
The "TAB NS Nord 22" terminal strip is structured in accordance with the standard wording for technical connection conditions under the title "TAB NS NORD 2019" (TAB 2019). It is responsible for the connection and operation of plants on the low-voltage grid in the area of the BDEW regional group Northern Germany together with the BDEW regional group Berlin/Brandenburg. The terminal blocks are designed with the PUSH IN connection technology. Please always refer to the supplementary sheets of the respective grid operator.
The "TAB NS Nord 14" terminal strip is structured in accordance with the standard wording for technical connection conditions under the title "TAB NS NORD 2019" (TAB 2019). It is responsible for the connection and operation of plants on the low-voltage grid in the area of the BDEW regional group Northern Germany together with the BDEW regional group Berlin/Brandenburg. The terminal blocks are designed with the PUSH IN connection technology. Please always refer to the supplementary sheets of the respective grid operator.
The "VDE FNN" terminal strip is designed in accordance with the "VDE FNN note for meter stations with semi-indirect measurements up to 1000 A in low voltage (for transformer systems)". It refers to version 1.0 from June 2022 and is used to standardize semi-indirect measurements (transformer measurements). This note is to be applied together with VDE-AR-N 4100:2019 and VDE-AR-N 4100 authorization 1:2019. The terminal blocks are designed with the PUSH IN connection technology.
The "VDE FNN" terminal strip is designed in accordance with the "VDE FNN note for meter stations with semi-indirect measurements up to 1000 A in low voltage (for transformer systems)". It refers to version 1.0 from June 2022 and is used to standardize semi-indirect measurements (transformer measurements). This note is to be applied together with VDE-AR-N 4100:2019 and VDE-AR-N 4100 authorization 1:2019. The terminal blocks are designed with the screw connection technology.
The "LST_CTVT_3PHASEPEATTB" terminal strip is a setup for 3 current and voltage transformers with N and PE connection. The 3 phases are color coded on the current transformer side with yellow (L1), green (L2) and violet (L3). In addition, the structure has the forced short-circuit function (MBB - Make Before Breake) and comparison measurement function.
The "LST_CTVT_3PHASEPEWTTB" terminal strip is a setup for 3 current and voltage transformers with N and PE connection. The 3 phases are color coded on the current transformer side with yellow (L1), green (L2) and violet (L3). In addition, the structure has the forced short-circuit function (MBB - Make Before Breake) and comparison measurement function.
The terminal strip "LST_CT_3PHASE_ATTB_OR" is an assembly of 6 terminals for 3 current transformers. The 3 phases have the has the forced short-circuit function (MBB - Make Before Breake) and comparison measurement function.
We make all of the information you need about our instrument transformer terminal blocks available for download here so that you can find out all about our products and their functions. Our catalogue contains a wide range of terminal blocks, and our brochures provide you will all of the information you need for the installation and use of our instrument transformer terminal blocks.
Weidmüller is a pioneer when it comes to panel building. We've been shaping the market with our innovative products for years. And our instrument transformer terminal blocks are no exception! You no longer need complicated intermediate steps in order to short-circuit a current transformer because the measuring device needs to be maintained or replaced. With the Weidmüller terminal block, this can be done in a single lever movement. This allows the best possible protection for personnel and devices. We're happy to help and advise you on all of your concerns and questions. Our experts can be contacted at any time.
Peter Croucher
Product & Sales Specialist - Factory Automation
